Buying guide · 10 min read · Updated October 2, 2026

4 Best RV Battery Box For Lithium Batteries in 2026: A Practical RV Guide

Four Group 24 to 31 battery boxes that hold LiFePO4 batteries in RVs, compared on interior size, ventilation, hold-down straps and price.

By Bowen HigginsRV Editor at RV Gear Lab4 products comparedSpec-sheet researched

Lithium batteries do not gas, so the vented battery box you see on old lead-acid rigs is not strictly needed. A box still protects terminals, keeps the battery from sliding, and stops a loose wrench from shorting the posts. The key is internal size: many LiFePO4 batteries are Group 24, 27 or 31, and a box that is too tight will crush cables. These four boxes cover those sizes at different prices.

RV Gear Lab field notes

The Rig Fit Check

Start with the job: NOCO Snap-Top BG31 Battery Box leads this shortlist for buyers comparing capacity, compatibility, included components and storage needs. Use that fit as a reference point, then compare the alternatives against your own space and workload.
Specs that separate the picks: The first details to compare are Group 24 to 31 fit, 13.1 x 7 x 11 in, Group 29 and 31 fit. Confirm the exact model and included components before ordering.
Trade-off to plan for: Not rated for water immersion or heavy splashing

Before you buy

What Matters Before You Choose an RV Battery Box For Lithium Batteries

Key buying criteria so you get the right fit the first time.

01
Interior dimensions versus battery
A Group 31 battery is about 13 x 6.77 x 8.5 inches. If the box interior is shorter, cables bind and terminals touch. Measure the battery and add 0.5 inch.
02
Terminal headroom
Lithium terminals need cable clearance. The Camco Group 24 lists 2 inches of headroom. Check the listing for lid clearance.
03
Hold-down strap strength
A loose battery is dangerous in a crash. The Attwood 9084-1 lists a 350 lb rated strap. Look for a rating, not just strap included.
04
Water and ventilation design
Lithium does not gas, but wet bays corrode lugs. The Attwood PowerGuard has upward vents. Check whether vents face up.
05
Standards and cold impact
Boxes that cite USCG 183.420 and ABYC E-10.7 meet marine hold-down rules. The NOCO BG31 and Camco Group 24 list both. This is not a lithium certification, so confirm separately.

Our standards

Why You Can Trust RV Gear Lab

At RV Gear Lab, we compare products based on rig fit and power or hookup compatibility, verified specifications, usability, setup requirements, weight, durability, and real-world trade-offs. We do not rank products purely on marketing claims or commission rates.

We have not personally tested every product listed. Where hands-on testing is not available, recommendations are based on verified manufacturer specifications, product documentation, use-case fit, and comparative research.

How we review RV gear →

Detailed reviews

The 4 best rv battery box for lithium batteries, explained

Best Overall · 1 of 4

NOCO Snap-Top BG31 Battery Box

Group 24 to 31 fit
Meets USCG 183.420, ABYC E-10.7
48 in strap, divider included

Check price on Amazon

Best for: Buyers comparing capacity, compatibility, included components and storage needs

Our take

It is $4.61 cheaper than the Camco Group 24 and $30.11 cheaper than the Attwood PowerGuard.

Why it made the shortlist

The NOCO BG31 is a $20.38 snap-top box for Group 24 to 31 batteries, including lithium-ion. It uses a honeycomb lattice for rigidity, lists impact resistance down to -20°F, and meets USCG 183.420 and ABYC E-10.7. A divider, 48 inch strap and mounting tray are included.

Pick this for the broadest fit at the lowest price.

What works

One box fits Group 24, 27 and 31 batteries
Cheapest of the four at $20.38
Strap, divider and mounting tray come in the box

Watch out for

Not rated for water immersion or heavy splashing
Optional vent holes need a call on your battery

The catch: It adds adjustable sizing but fewer weather features.

Check price on Amazon

Best for Wet Locations · 2 of 4

attwood PowerGuard Pro

13.1 x 7 x 11 in
Upward vents, folding panels
Impact-tested -20°F to 120°F

Check price on Amazon

Best for: Wet bumper or bay mounting

Our take

It costs $25.50 more than the Camco Group 24 and $30.11 more than the NOCO BG31.

Why it made the shortlist

The Attwood PowerGuard Pro is a $50.49 box with removable spacer blocks for Group 24, 27 and 31 batteries. Interior is 13.1 x 7 x 11 inches, with upward-facing vents and folding panels that reach terminals without removing the strap.

You pay for splash-resistant vents (up to 94% less water intake per the listing) and quick terminal access. Pick this for a bumper or bay that gets wet.

What works

Vents are designed to cut water intake
Folding panels reach terminals without removing the strap
Spacer blocks adapt to three group sizes

Watch out for

Costs $50.49, the most of the four
Holds batteries only up to 9.3 inches tall

Check price on Amazon

Best for Group 31 · 3 of 4

Attwood 9084-1 Large Vented Battery Box with Mounting Strap

Group 29 and 31 fit
15-7/16 x 6-15/16 x 9-3/4 in
350 lb rated strap

Check price on Amazon

Best for: Group 31 lithium batteries

Our take

It is $0.80 below the Camco Group 24 and $3.81 above the NOCO BG31.

Why it made the shortlist

The Attwood 9084-1 is a $24.19 vented box for Group 29 and 31 batteries. Inside it measures 15-7/16 x 6-15/16 x 9-3/4 inches. A 40 inch strap rated for 350 lbs of force comes with it.

It is the roomiest here for long batteries like 100Ah Group 31. Pick this when your battery is Group 31.

What works

Roomy interior fits Group 31 lithium batteries
Strap is rated for 350 lbs of force
Acid-resistant polypropylene is impact-tested down to -20°F

Watch out for

No spacer for smaller Group 24 batteries
Vented design lets some water in

The catch: Caveat: it is not adjustable for smaller Group 24 batteries.

Check price on Amazon

Best for Group 24 · 4 of 4

Camco Heavy Duty Group 24 Marine RV Battery Box with Strap

Group 24 only
7-1/4 x 10-3/4 x 8 in
Lift-off lid, woven strap

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Best for: Group 24 drop-in lithium batteries

Our take

It costs $4.61 more than the NOCO BG31 and $0.80 more than the Attwood 9084-1.

Why it made the shortlist

The Camco Group 24 box costs $24.99 and has inside dimensions of 7-1/4 wide, 10-3/4 long and 8 inches tall, with 2 inches of headroom for terminals. It ships with a lift-off lid, woven strap, foot clamps and stainless screws.

Pick this for a 12V 100Ah Group 24 drop-in.

What works

Lift-off lid gives easy terminal access
2 inches of headroom for terminal hardware
Stainless screws and foot clamps included

Watch out for

Fits Group 24 only, no spacers

Check price on Amazon

Methodology

How We Built This Shortlist

Each pick was assessed across 4 criteria weighted for real-world use.

Interior fit

We compared listed interior dimensions to Group 24, 27 and 31 batteries.

Ventilation and water

We checked vent design and weather protection claims.

Hold-down and standards

We looked at strap rating and USCG or ABYC compliance.

Price

We weighed cost against included hardware.

Decision guide

Match an RV Battery Box For Lithium Batteries to Your RV

By Battery Group Size

Your situation	Recommended pick	Why
Group 24 drop-in	Camco Group 24	Sized for Group 24 with 2 inches of terminal headroom.
Group 31, 100Ah	Attwood 9084-1	Interior is built for Group 29 and 31.
Unsure or mixed sizes	NOCO BG31	Fits Group 24 to 31 with a divider.
Group 24, 27 or 31 in a wet spot	Attwood PowerGuard	Spacer blocks plus vents that reduce water entry.

By Budget

Budget	Recommended pick
$20 to $30	NOCO BG31 or Attwood 9084-1
$20 to $60	Camco Group 24 or Attwood PowerGuard

Vented vs Plain Mindset

Vented boxes

Attwood 9084-1 and Attwood PowerGuard release gas, meant for lead-acid, harmless for lithium.

Plain boxes

NOCO BG31 and Camco Group 24 offer optional or no venting and focus on protection.

Lithium does not need venting, so default to fit and strap strength.

By Budget

Recommended	Recommended pick
Under $22	NOCO BG31
$22 to $26, specific group	Attwood 9084-1
Over $50, wet mounting	Attwood PowerGuard

For Bay-Mounted Lithium Installs Specifically

Look for

Interior dimensions at least 0.5 inch larger than your battery plus terminal headroom.

In this comparison

The Camco Group 24 provides 8 inches height plus 2 inches headroom, while the Attwood 9084-1 handles 9-3/4 inch tall batteries.

When to Spend More

Spend more if

if the box sits where water hits it, the $50.49 Attwood PowerGuard has the best vent design.

Save if

if the battery lives inside a dry compartment, the $20.38 NOCO BG31 is enough.

FAQ

Before You Bring One Home

Does a lithium battery need a vented box?

LiFePO4 does not release hydrogen in normal use. Follow your battery maker's guidance.

Which box fits a Group 31 lithium battery?

The Attwood 9084-1 and NOCO BG31 fit Group 31. The Camco Group 24 does not.

Are these boxes fireproof?

No. None of these listings claim fire resistance.

Can I mount the box inside the RV?

Check your battery maker's instructions and RV rules. These listings target marine and RV use.

Bottom line

The short version

Browse more rv battery box for lithium batteries on Amazon →

About the author

Bowen Higgins

RV Editor at RV Gear Lab

Bowen covers RV power, water systems, towing and leveling, upkeep and interior comfort, with a focus on matching gear to the rig, the hookups and the way you actually travel.

4 Best RV Battery Box For Lithium Batteries in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose an RV Battery Box For Lithium Batteries

Interior dimensions versus battery

Terminal headroom

Hold-down strap strength

Water and ventilation design

Standards and cold impact

Why You Can Trust RV Gear Lab

The 4 best rv battery box for lithium batteries, explained

NOCO Snap-Top BG31 Battery Box

attwood PowerGuard Pro

Attwood 9084-1 Large Vented Battery Box with Mounting Strap

Camco Heavy Duty Group 24 Marine RV Battery Box with Strap

How We Built This Shortlist

Interior fit

Ventilation and water

Hold-down and standards

Price

Match an RV Battery Box For Lithium Batteries to Your RV

By Battery Group Size

By Budget

Vented vs Plain Mindset

By Budget

For Bay-Mounted Lithium Installs Specifically

When to Spend More

Before You Bring One Home

Does a lithium battery need a vented box?

Which box fits a Group 31 lithium battery?

Are these boxes fireproof?

Can I mount the box inside the RV?

The short version

Bowen Higgins

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